Loose the right to the trademark?

[braveheart]

Virginia State -

Company A filed for a trademark and got the trademark. Company B claimed that they have use the name before Company A. Will Company A loose the right to the trademark that they got from USPTO?

Thanks in advance,

Braveheart

 

[T-DESIGNER]

"...............What are common law rights?

Federal registration is not required to establish rights in a
trademark. Common law rights arise from actual use of a mark.
Generally, the first to either use a mark in commerce or file an
intent to use application with the Patent and Trademark Office
has the ultimate right to use and registration. However, there
are many benefits of federal trademark registration................

What is a common law search? How can I do one? Is doing a
common law search necessary?

A common law search involves searching records other than the
federal register and pending application records. It may involve
checking phone directories, yellow pages, industrial directories,
state trademark registers, among others, in an effort to
determine if a particular mark is used by others when they have
not filed for a federal trademark registration. A common law
search is not necessary but some find it beneficial. Telephone
numbers for search firms that perform these searches for a fee
can be found in the yellow pages of local phone directories and
through an Internet search...............

Who may file an application?

Only the owner of the trademark may file an application for its
registration. An application filed by a person who is not the
owner of the mark will be declared void. Generally, the person
who uses or controls the use of the mark, and controls the
nature and quality of the goods to which it is affixed, or the
services for which it is used, is the owner of the mark............."

source: http://www.uspto.gov/web/offices/tac/tmfaq.htm#Basic001